Compilare: user.cpp: In function ‘int main()’: user.cpp:21:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf[buf[i]]==1){ ^ user.cpp:8:11: warning: unused variable ‘n’ [-Wunused-variable] int i,n,con,p2,nr,x,last; ^ user.cpp:11:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAXBUF,fi); ^